WO1998031657A1 - PREPARATION D'AMIDES DE L'ACIDE α-AMINO-CARBOXYLIQUE - Google Patents
PREPARATION D'AMIDES DE L'ACIDE α-AMINO-CARBOXYLIQUE Download PDFInfo
- Publication number
- WO1998031657A1 WO1998031657A1 PCT/US1997/024066 US9724066W WO9831657A1 WO 1998031657 A1 WO1998031657 A1 WO 1998031657A1 US 9724066 W US9724066 W US 9724066W WO 9831657 A1 WO9831657 A1 WO 9831657A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- amide
- carboxylic acid
- amino carboxylic
- amino
- acid amide
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C231/00—Preparation of carboxylic acid amides
- C07C231/06—Preparation of carboxylic acid amides from nitriles by transformation of cyano groups into carboxamide groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2601/00—Systems containing only non-condensed rings
- C07C2601/06—Systems containing only non-condensed rings with a five-membered ring
- C07C2601/08—Systems containing only non-condensed rings with a five-membered ring the ring being saturated
Definitions
- the present invention relates to a process for producing ⁇ -amino carboxylic acid amides.
- Such amides are useful as intermediates for N-substituted heterocyclic pharmaceutical compositions useful in the treatment of cardiovascular diseases including hypertension, as well as glaucoma, diabetic retinopathy and renal insufficiency.
- the pharmaceutical compositions demonstrate antagonistic action against angiotensin II, a potent vasopressor.
- U.S. Patent No. 5,352,788 discloses a synthesis that involves the hydrolysis of the oxalate salt of the aminonitrile using concentrated sulfuric acid, followed by treatment with ammonia and then extraction with chloroform containing 5% methanol .
- this method has many disadvantages. It is therefore an object of the present invention to provide a method of producing aminoamides directly from the corresponding aminonitrile.
- the problems of the prior art have been overcome by the present invention, which provides a method of preparing ⁇ -amino carboxylic acid amides directly from aminonitriles in high yield and purity by acid hydrolysis.
- the method involves preparing the amide hydrochloride directly from the corresponding aminonitrile in the presence of water, a strong mineral acid such as HCl, and an organic solvent in which the resulting salt of the aminonitrile is insoluble or substantially insoluble.
- HCl the hydrochloride salt readily precipitates from the solvent, and can be isolated by filtration in high purity. The solvent and excess HCl can be recycled with no significant color build-up or product quality deterioration.
- the present invention can be .used in connection with any ⁇ -amino carboxylic acid, provided that the corresponding salt is insoluble in the solvent employed.
- Suitable ⁇ -amino carboxylic acids include valine, glycine, alanine and leucine, with glycine, leucine and cycloleucine being particularly- preferred.
- the amino nitrile can be virtually any ⁇ -aminonitrile corresponding to the ⁇ -amino carboxylic acid desired, and can be prepared from the corresponding ketone by conventional means well known to those skilled in the art.
- the ketone in a suitable solvent such as methanol can be reacted with an ammonia source (such as ammonia and ammonium chloride) and a cyanide source (such as alkali metal cyanide) , and the resulting amino nitrile can be recovered by extraction with methylene chloride and dried.
- an ammonia source such as ammonia and ammonium chloride
- a cyanide source such as alkali metal cyanide
- the amino nitrile is dissolved in a solvent in which the amino carboxylic acid amide salt readily precipitates.
- suitable solvents include dialkyl ethers such as diethyl ether, and dialkyl ethylene glycols such as ethylene glycol dimethyl, diethyl, dibutyl, butyl methyl and propyl ethyl ether; secondary alcohols such as isopropanol (preferably anhydrous) ; hydrocarbons such as heptane and hexane; and ketones such as acetone.
- the particular solvent should be chosen such that it is a solvent in which the amino nitrile has sufficient solubility to by acid hydrolyzed, and in which the salt formed by the reaction is at least substantially insoluble, ensuring that it can be easily isolated from the reaction medium. As the solubility of the salt in the solvent increases, the yield will decrease. Ether solvents are preferred, with dimethoxyethane being an especially preferred solvent.
- Water is added to the reaction medium, preferably in an amount of about 0.5 to 4 equivalents based upon the amount of amino nitrile employed, most preferably one equivalent based upon the amount of amino nitrile employed. High excesses of water lead to the production of the amino acid rather than the desired amide.
- the reaction mixture is then cooled to a temperature in the range of 0-50°C,. preferably below about 30°, most preferably to about 10 °C, and a suitably strong mineral acid is added while keeping the reaction temperature within the aforementioned range and preferably below about 30°C. Higher temperatures tend to result in undesirable side reactions.
- Suitable mineral acids include HCl, HBr, H 2 S0 4 , toluene sulfonic acid, methane sulfonic acid and trifluoro acetic acid. Since excess water is deleterious to the reaction, leading to the generation of alkyl chloride, for example, it is preferred that the strong mineral acid be added in anhydrous form, especially once the appropriate amount of water is already in the system. Suitable amounts of mineral acid range from about 1 to about 6 equivalents, with 3-4 equivalents being preferred in order to reduce reaction times. Preferably the acid is added over time, such as 60 minutes.
- the reaction mixture is sealed, warmed to a temperature of about 40°C or higher to effect conversion to the ⁇ -amino carboxylic amide salt, allowed to react to completion (about 4-20 hours), and cooled.
- a closed system is used, since at temperatures higher than 40°C, the loss of acid gas to the atmosphere becomes problematic. At temperatures below 40°C, the reaction is very sluggish.
- the resulting amide salt readily precipitates, which allows for easy isolation and purification.
- the salt can be collected by filtration and washed with additional solvent.
- amide salt can be easily converted to the free amide acid by the addition of a suitable alkaline reagent, such as ammonium hydroxide or alkali metal hydroxide, preferably sodium or potassium hydroxide .
- a suitable alkaline reagent such as ammonium hydroxide or alkali metal hydroxide, preferably sodium or potassium hydroxide .
- the amino nitrile of cyclopentanone was prepared using methods commonly found in the literature.
- the amino nitrile of cyclopentanone (40.00g, 0.36 mole) was added to a 500 ml round bottom flask equipped with a mechanical ⁇ tirrer, a thermocouple, and a gas inlet tube.
- DME dimethoxyethane
- 6.55g (0.36 mole) of water
- the reaction was cooled to ⁇ 10°C.
- Anhydrous HCl (53.14g, 1.46 moles) was bubbled into the reaction mixture keeping the reaction temperature below 30°C. The HCl was added over a 60 minute period.
- EXAMPLE 2 2.8 g (0.05 ol) of anhydrous, liquid glycinonitrile was dissolved in 1, 2-dimethoxyethane in a 125 ml Erlenmeyer flask. 9.2 g of anhydrous HCl was bubbled into the flask with cooling to the desired weight. 0.9 g (0.05 mol) of water was added, and the reaction mixture was stirred at the desired temperature for 6 hours. The product was filtered off, washed with additional solvent, and dried under vacuum. The yield of amide was 92.0%.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Medicinal Preparation (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Abstract
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU57239/98A AU728197B2 (en) | 1997-01-16 | 1997-12-22 | Preparation of alpha-amino carboxylic acid amides |
BR9714185-2A BR9714185A (pt) | 1997-01-16 | 1997-12-22 | Preparação de amidas de ácido a-amino carboxìlico |
EP97953506A EP0964848A4 (fr) | 1997-01-16 | 1997-12-22 | Preparation d'amides de l'acide alpha-amino-carboxylique |
JP53336598A JP2001508073A (ja) | 1997-01-16 | 1997-12-22 | α−アミノカルボン酸アミドの製法 |
DE0964848T DE964848T1 (de) | 1997-01-16 | 1997-12-22 | Preparation of alpha-amino carboxylic acid amides |
CA002274527A CA2274527A1 (fr) | 1997-01-16 | 1997-12-22 | Preparation d'amides de l'acide .alpha.-amino-carboxylique |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US78481897A | 1997-01-16 | 1997-01-16 | |
US08/784,818 | 1997-01-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998031657A1 true WO1998031657A1 (fr) | 1998-07-23 |
Family
ID=25133620
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1997/024066 WO1998031657A1 (fr) | 1997-01-16 | 1997-12-22 | PREPARATION D'AMIDES DE L'ACIDE α-AMINO-CARBOXYLIQUE |
Country Status (12)
Country | Link |
---|---|
EP (1) | EP0964848A4 (fr) |
JP (1) | JP2001508073A (fr) |
KR (1) | KR20000070259A (fr) |
CN (1) | CN1244858A (fr) |
AU (1) | AU728197B2 (fr) |
BR (1) | BR9714185A (fr) |
CA (1) | CA2274527A1 (fr) |
DE (1) | DE964848T1 (fr) |
ES (1) | ES2143445T1 (fr) |
IN (1) | IN187448B (fr) |
WO (1) | WO1998031657A1 (fr) |
ZA (1) | ZA98115B (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008145626A1 (fr) * | 2007-05-31 | 2008-12-04 | Basf Se | Procédé de fabrication de nitriles |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4950788A (en) * | 1988-02-25 | 1990-08-21 | Allied Colloids Limited | Process for producing unsaturated carboxylic acids |
US5606098A (en) * | 1994-02-04 | 1997-02-25 | Ao "Avtokoninvest" | Amides and esters of perfluoropolyoxaalkylene-sulfo- or perfluoropolyoxaalkylene-carboxylic acids and a process for producing same |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4017510A (en) * | 1975-11-12 | 1977-04-12 | American Cyanamid Company | Imidazoisoindolediones and the use thereof as herbicidal agents |
-
1997
- 1997-12-22 JP JP53336598A patent/JP2001508073A/ja active Pending
- 1997-12-22 CN CN97181422A patent/CN1244858A/zh active Pending
- 1997-12-22 AU AU57239/98A patent/AU728197B2/en not_active Ceased
- 1997-12-22 BR BR9714185-2A patent/BR9714185A/pt not_active IP Right Cessation
- 1997-12-22 EP EP97953506A patent/EP0964848A4/fr not_active Withdrawn
- 1997-12-22 DE DE0964848T patent/DE964848T1/de active Pending
- 1997-12-22 CA CA002274527A patent/CA2274527A1/fr not_active Abandoned
- 1997-12-22 KR KR1019997006487A patent/KR20000070259A/ko not_active Application Discontinuation
- 1997-12-22 ES ES97953506T patent/ES2143445T1/es active Pending
- 1997-12-22 WO PCT/US1997/024066 patent/WO1998031657A1/fr not_active Application Discontinuation
-
1998
- 1998-01-02 IN IN9DE1998 patent/IN187448B/en unknown
- 1998-01-07 ZA ZA98115A patent/ZA98115B/xx unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4950788A (en) * | 1988-02-25 | 1990-08-21 | Allied Colloids Limited | Process for producing unsaturated carboxylic acids |
US5606098A (en) * | 1994-02-04 | 1997-02-25 | Ao "Avtokoninvest" | Amides and esters of perfluoropolyoxaalkylene-sulfo- or perfluoropolyoxaalkylene-carboxylic acids and a process for producing same |
Non-Patent Citations (1)
Title |
---|
See also references of EP0964848A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008145626A1 (fr) * | 2007-05-31 | 2008-12-04 | Basf Se | Procédé de fabrication de nitriles |
Also Published As
Publication number | Publication date |
---|---|
AU5723998A (en) | 1998-08-07 |
ZA98115B (en) | 1998-07-09 |
EP0964848A4 (fr) | 2004-08-04 |
CN1244858A (zh) | 2000-02-16 |
JP2001508073A (ja) | 2001-06-19 |
AU728197B2 (en) | 2001-01-04 |
DE964848T1 (de) | 2001-02-08 |
CA2274527A1 (fr) | 1998-07-23 |
IN187448B (fr) | 2002-04-27 |
EP0964848A1 (fr) | 1999-12-22 |
BR9714185A (pt) | 2000-02-29 |
KR20000070259A (ko) | 2000-11-25 |
ES2143445T1 (es) | 2000-05-16 |
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